Medium Phosphorus Electroless Nickel Plating

Niplate 600 is a medium phosphorus (5-9% in P) electroless nickel plating. Niplate 600 is the most widely used of all Niplate platings thanks to its high wear resistance, good corrosion resistance, and low cost.

The Niplate 600 coating is extremely versatile and is used to impart corrosion and wear protection to mechanical components in the automotive, hydraulic, and pneumatic sectors.

Due to its high hardness value, the coating plating offers protection against sliding wear, fretting wear, and erosion. Hardening treatments make it possible to achieve 1000 HV, equivalent to hard chrome. In fact, the treatment is employed in place of hard chrome platings for applications such as piston rods or cylinders, with the benefit, compared to hard chrome, that it can be applied on all alloys, and also offering better corrosion resistance.

The corrosion resistance of the Niplate 600 film makes it possible to protect brass parts against oxidation and corrosion such as valve bodies in the automotive and oxygen sector and forged brass parts, requiring high salt spray corrosion resistance.

Brake pistons with Niplate 600 medium phosphorus electroless nickel plating


Thanks to its hardness and microcrystalline structure, Niplate 600 offers high wear and fretting resistance.


Compared to the other Niplate treatments, considering the same coating thickness, Niplate 600 is more economical thanks to the high efficiency of the deposition process.


Uniform and constant coating thickness over the entire surface, including holes; ideal for precision machined parts with tight tolerances and complex geometries.


All metals commonly used in mechanical field can be coated: alloys of iron, copper, and aluminium.


Composition and applicable standards

Ni-P alloy, medium phosphorus electroless nickel plating
Technical standards
ISO 4527 | NiP(7)
ASTM B733 | Type IV
NSF 51 certification
NSF 51 certification – Food equipment material.
RoHS compliance
RoHS compliant. No restricted substances present in amounts greater than the maximum tolerated concentrations.
REACH compliance
REACH compliant. No SVHCs present in amounts higher than 0.1% by weight.

Coatable metals

Iron alloysCharacteristics
Carbon steelAdhesion★★★★★
Corrosion resistance★★★☆☆
Stainless steelPre-treatmentSand blasting
Corrosion resistance★★★★★
Case hardened steelPre-treatmentSand blasting
Corrosion resistance★★★☆☆
Nitrided steelPre-treatmentSand blasting
Corrosion resistance★★★☆☆
Copper alloysCharacteristics
Brass, Bronze, CopperAdhesion★★★★★
Corrosion resistance★★★★★
Aluminium alloysCharacteristics
Machining alloysAdhesion★★★★☆
Corrosion resistance★★★★☆
Foundry alloysAdhesion★★★★☆
Corrosion resistance★★★☆☆
Titanium alloysCharacteristics
Pure titanium and titanium alloysPre-treatmentSand blasting
Corrosion resistance★★★★★

Coating thickness and aesthetic appearance

Coating thickness
Nominal thickness, as requiredTolerance
3÷75µm±10% (min. ±2µm)
Uniform thickness over the entire external and internal surface
Absence of tip effect typical of galvanic coatings
Aesthetic appearance
Bright stainless steel metallic appearance that reproduces the morphology of the machined part
Option of matt finish (sand blasted, shoot peened, or grit blasted)
Hardening treatments may result in discolouration of the coating:
• 260-280°C, white colour with possible yellow stains
• 340°C, iridescent blue-red colouring

Tribological properties

The surface hardness of Niplate 600 varies in relation to the hardening heat treatment carried out after deposition of the coating.
Hardness valueHeat treatment
Hydrogen embrittlement relief at 160-180°C for 4h
Hardening at 260 -280°C for 8h
Hardening at 340°C for 4h
Wear resistance
Niplate 600 offers a high level of wear resistance, depending on the heat treatment carried out.
Guideline wear value, TWI-CS10Heat treatment
The lower the number, the higher the performance – ASTM B733 X1 – Taber Abraser wear test – CS 10 abrasive wheels – 1 kg load
16±2 mg / 1000 cycles
Hydrogen embrittlement relief at 160-180°C for 4h
12±2 mg / 1000 cycles
Hardening at 260 -280°C for 8h
9±2 mg / 1000 cycles
Hardening at 340°C for 4h
Friction coefficient
Dynamic dry friction coefficient value
0.4 ÷ 0.6 depending on the antagonist material

Chemical properties

Corrosion resistance
The corrosion protection of Niplate 600, assessed by means of the salt spray test, depends on the substrate material, machining and finish of the part, and the applied film thickness.
Guideline corrosion resistance valuesSubstrate material
NSS to ISO 9227 – Thickness 20 μm – corroded surface < 5%
≥1000 hours
≥180 hours
Carbon steel
≥240 hours
Aluminium 6082
Chemical resistance
For applications requiring high chemical resistance, Niplate 500 should be used in place of Niplate 600. Niplate 600 anyway offers a good level of chemical resistance, especially in alkaline environments.
Chemical compatibility
Chemical compatibility values are referred exclusively to the coating and do not define the corrosion protection of the substrate material. The overall performance of the coated part is highly dependent also on the type and quality of the substrate material. The actual environmental resistance must anyway be tested in the field.
Hydrocarbons (e.g. petrol, diesel, mineral oil, toluene)
Alcohol, ketones (e.g. ethanol, methanol, acetone)
Neutral saline solutions (e.g. sodium chloride, magnesium chloride, seawater)
Dilute reducing acids (e.g. citric acid, oxalic acid)
Acid oxidizing agents (e.g. nitric acid)
Concentrated acids (e.g. sulphuric acid, hydrochloric acid)
Dilute bases (e.g. dilute sodium hydroxide)
Base oxidizing agents (e.g. sodium hypochlorite)
Concentrated bases (e.g. concentrated sodium hydroxide)

Physical properties

Easily brazed using RMA, RA acid fluxes
FerromagnetismHeat treatment
FerromagneticHydrogen embrittlement relief at 160-180°C for 4h
FerromagneticHardening at 260 -280°C for 8h
FerromagneticHardening at 340°C for 4h
Fusion point, solidus
8.1 g/cm3